Broadband matrix-type feeding networks for two-beam antennas with constant beamwidth and efficient aperture utilization

Staszek, Kamil; Odrobina, Szczepan; Wincza, Krzysztof; Gruszczyński, Sławomir

doi:10.1080/09205071.2018.1536565

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…As shown, multiple-beam radiation patterns can be achieved with such a beamforming network. As presented, even wider bandwidths can be achieved by the utilization of modified Butler matrices which change their behavior three times across the operational frequency range [24]. However, the major drawback of these solutions is the complexity of the applied beamforming networks, which limits the applicability of the described concepts [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…As presented, even wider bandwidths can be achieved by the utilization of modified Butler matrices which change their behavior three times across the operational frequency range [24]. However, the major drawback of these solutions is the complexity of the applied beamforming networks, which limits the applicability of the described concepts [23,24]. A simpler approach to the realization of scalable multibeam antennas is presented in [25], where the feeding network consists of a broadband quadrature directional coupler and frequency-dependent power dividers.…”

Section: Introductionmentioning

confidence: 99%

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Octave-Band Four-Beam Antenna Arrays with Stable Beam Direction Fed by Broadband 4 × 4 Butler Matrix

et al. 2021

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A novel concept of four-beam antenna arrays operating in a one-octave frequency range that allows stable beam directions and beamwidths to be achieved is proposed. As shown, such radiation patterns can be obtained when radiating elements are appropriately spaced and fed by a broadband 4 × 4 Butler matrix with directional filters connected to its outputs. In this solution, broadband radiating elements are arranged in such a way that, for the lower and upper frequencies, two separate subarrays can be distinguished, each one consisting of identically arranged radiating elements. The subarrays are fed by a broadband Butler matrix at the output to which an appropriate feeding network based on directional filters is connected. These filters ensure smooth signal switching across the operational bandwidth between elements utilized at lower and higher frequency bands. Therefore, as shown, it is possible to control both beamwidths and beam directions of the resulting multi-beam antenna arrays. Moreover, two different concepts of the feeding network connected in between the Butler matrix and radiating elements for lowering the sidelobes are discussed. The theoretical analyses of the proposed antenna arrays are shown and confirmed by measurements of the developed two-antenna arrays consisting of eight and twelve radiating elements, operating in a 2–4 GHz frequency range.

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Section: Introductionmentioning

confidence: 99%